Matches in SemOpenAlex for { <https://semopenalex.org/work/W2008702929> ?p ?o ?g. }
- W2008702929 abstract "[1] During magnetic storms, relativistic electrons execute nearly circular orbits about the Earth and traverse a spatially confined zone within the duskside plasmapause where electromagnetic ion cyclotron (EMIC) waves are preferentially excited. We examine the mechanism of electron pitch-angle diffusion by gyroresonant interaction with EMIC waves as a cause of relativistic electron precipitation loss from the outer radiation belt. Detailed calculations are carried out of electron cyclotron resonant pitch-angle diffusion coefficients Dαα for EMIC waves in a multi-ion (H+, He+, O+) plasma. A simple functional form for Dαα is used, based on quasi-linear theory that is valid for parallel-propagating, small-amplitude electromagnetic waves of general spectral density. For typical observed EMIC wave amplitudes (1–10nT), the rates of resonant pitch-angle diffusion are close to the limit of “strong” diffusion, leading to intense electron precipitation. In order for gyroresonance to take place, electrons must possess a minimum kinetic energy Emin which depends on the value of the ratio (electron plasma frequency/electron gyrofrequency); Emin also depends on the properties of the EMIC wave spectrum and the ion composition. Geophysically interesting scattering, with Emin comparable to 1 MeV, can only occur in regions where (electron plasma frequency/electron gyrofrequency) ≥10, which typically occurs within the duskside plasmapause. Under such conditions, electrons with energy ≥1 MeV can be removed from the outer radiation belt by EMIC wave scattering during a magnetic storm over a time-scale of several hours to a day." @default.
- W2008702929 created "2016-06-24" @default.
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- W2008702929 date "2003-01-01" @default.
- W2008702929 modified "2023-10-09" @default.
- W2008702929 title "Relativistic electron pitch-angle scattering by electromagnetic ion cyclotron waves during geomagnetic storms" @default.
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- W2008702929 doi "https://doi.org/10.1029/2002ja009489" @default.
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